---
title: "Burn rate: the cash number your P&L can't give you"
description: What to track if you run a venture-backed startup or an owner-run business, what each number reveals, and how to tell a timing problem from a model problem.
image: https://www.countabl.io/hubfs/og-image.png
---

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[Cash & Runway](https://www.countabl.io/notes/tag/cash-runway) June 26, 2026

# Burn rate: the cash number your P&L can't give you

What to track if you run a venture-backed startup or an owner-run business, what each number reveals, and how to tell a timing problem from a model problem.

Burn is the rate cash leaves your business. For a venture-backed founder, the job is to reach the next milestone, the proof that earns the next round or gets you to profitability, before the capital you've raised runs out. For an owner-run business, the job is to know how much cash the business uses before it pays you, and how much room you have if sales drop. Either way, a profitable P&L can still drain the account, and it won't tell you how fast.

Most of this Note applies to both. Where the advice splits, it follows the kind of business you run.

Both versions are shown below, each one labeled.

If you run an owner-run business

The short version

**1. Net burn, monthly.** Everything that left the bank minus what customers paid you. It shows whether the business is adding cash or using it, whatever the P&L says.

**2. Your floor.** The fixed costs that keep going if sales stop, including the owner pay the business has to support. It's your real exposure.

**3. Margin of safety.** How far collections can fall before you stop covering that floor.

**The decision:** before a hire, a lease, a loan or a large purchase, check what it does to your floor and your margin of safety, not only to profit.

If you run a venture-backed startup

The short version

**1. Net burn, monthly.** All cash out minus customer collections. Investment money pays for burn; it doesn't reduce it.

**2. Runway against the milestone.** How many months your cash lasts on the current plan, compared with how many you need to reach the next milestone *and* raise on it.

**3. Burn multiple.** Net burn divided by the annualized revenue you added over the same period. It shows what each dollar of burn is buying.

**The decision:** if runway doesn't cover the milestone plus the raise, change the plan now, while you still have the most options: what you spend on, the order you hire in, or when you start raising.

The rest of this Note shows where those numbers come from and where each one can mislead you.

## Three basic numbers

**[Gross burn](https://www.countabl.io/tools/glossary#g-gross-burn)** is everything that left the bank in a month: payroll, rent, suppliers, cost of sales, debt payments, tax, owner draws. **[Net burn](https://www.countabl.io/tools/glossary#g-net-burn)** is gross burn minus the cash customers paid you. Spend $200,000 and collect $180,000, and net burn is $20,000. Loan draws, owner contributions and investment don't count as cash in here. They add to the bank balance, but they pay for burn rather than reduce it.

Divide cash on hand by net burn and you get **[runway](https://www.countabl.io/tools/glossary#g-runway)**: an estimate of how many months you last if this month repeats. It's only an estimate, because next month never repeats exactly. If you collected more than you spent, net burn is negative. You're adding cash, and runway isn't your question. The floor, below, is.

## Where the money goes: variable, fixed and committed

Gross burn is supposed to show how exposed you are if revenue stops. It can't on its own, because it adds together costs that behave in opposite ways:

- **Variable costs** move with sales: [cost of sales](https://www.countabl.io/tools/glossary#g-cogs), materials, subcontractors, card processing, commissions. When sales fall, most of these fall too, though rarely in the same week.
- **Fixed costs** keep going: salaries, rent, insurance, software, debt payments, and the owner pay the business has to support. Together they're your **floor**, what you'd still spend each month if sales stopped and you hadn't cut anything yet.
- **[Committed costs](https://www.countabl.io/tools/glossary#g-committed-burn)** are the part of the floor you couldn't cut inside ninety days even if you tried: leases, loan payments, contracts, the payroll you'd keep.

How much of your spending is variable depends almost entirely on what you sell. Four illustrative businesses:

Illustrative · each bar is that business's monthly cash out

Where each dollar of burn goes

Committed (can't cut in 90 days) Other fixed (could cut) Variable (falls with sales)

**Venture-backed software startup** · $200K a month

$140K

$35K

$25K

Committed $140K · other fixed $35K · variable $25K.  
Floor: **$175K** a month. Collects $120K, so net burn is $80K.

**Owner-run agency** · $200K a month

$105K

$25K

$70K

Committed $105K · other fixed $25K · variable $70K.  
Floor: **$130K** a month. Collects $195K, so net burn is $5K.

**Owner-run contractor** · $200K a month

$45K

$140K materials and subs

Committed $45K · other fixed $15K · variable $140K.  
Floor: **$60K** a month. Collects $205K, so it adds $5K of cash.

**Owner-run home-services business** · $40K a month

$20K

$6K

$14K parts and fees

Committed $20K (two techs' payroll, truck loans, shop lease, insurance) · other fixed $6K (marketing, the owner's draw above a minimum) · variable $14K.  
Floor: **$26K** a month. Collects $42K, so it adds $2K of cash.

The software company's costs are almost all people and contracts, so little of it goes away when revenue does. The contractor's costs are mostly materials and subs, so its floor is under a third of its spending. A low floor isn't the same as a safe business, though: the contractor and the home-services shop both have thin cushions, which comes up below. If you've only been watching gross burn, the same kind of number has been telling each of these businesses something different.

## Why your P&L doesn't show this

Profit and burn come apart for ordinary reasons, and they fall into two groups.

Cash leaves, the P&L barely notices

**Debt principal.** Interest is an expense; principal isn't. Both leave the bank.

**Equipment.** A $60,000 truck is $60,000 of [capital spending](https://www.countabl.io/tools/glossary#g-capex) today and a small depreciation line for years.

**Owner draws.** They sit below the line, but the money is gone.

**Inventory bought ahead.** The cash goes out now. It reaches cost of sales when you sell it.

The P&L and the bank disagree on timing

**Receivables.** Revenue [booked in March](https://www.countabl.io/notes/ar-is-not-revenue) and collected in May.

**Customer prepayments.** An annual contract paid up front hits the bank today and the P&L over twelve months. Every month's burn looks better than it is until the renewal comes due.

**Tax.** Accrued monthly, paid in lumps.

**Non-cash expenses.** Depreciation, plus stock compensation at a funded startup. Both reduce profit without touching the account.

Start from the bank statement, not the income statement. Gross burn is what actually left the account, and it's usually more than the expense total on your P&L suggests. For the full walk from profit to cash, see [how to read a cash flow statement](https://www.countabl.io/notes/how-to-read-a-cash-flow-statement).

## Timing problem or business-model problem?

The most useful thing burn can tell you takes two versions of the number. Both count only customer collections as cash in. Loans, owner contributions and investment are left out of both, because they pay for burn rather than reduce it.

**Net burn**, the number above, counts every dollar out. It answers "when do we run out?"

**[Operating burn](https://www.countabl.io/tools/glossary#g-operating-burn)** compares customer cash collected with day-to-day cash costs, including interest and the taxes the business itself owes. It excludes loan principal, equipment purchases, and owner distributions, including money taken out to pay owners' personal income taxes. Those payments still reduce your cash, so include them in your cash forecast.

The practical point: covering day-to-day operations doesn't necessarily mean you can cover every cash payment.

Put the two side by side and a typical month lands in one of four places:

Read the two numbers together

Operations cover themselves · Bank balance holding

Covering itself

Owner-run: Your question moves to the floor: how much of it is committed, and how far can collections fall before you start burning?

Venture-backed: You don't need new money to keep going. The open question is whether you're investing fast enough to hit the milestone the round was meant to fund.

Operations cover themselves · Bank balance falling

Debt, equipment or draws

Owner-run: Day-to-day operations pay for themselves; the cash is going to loan principal, equipment or owner distributions. That isn't automatically fine. Check whether operating cash can keep covering loan payments, the equipment you'll have to replace, owners' tax distributions and a fair owner pay. If it can, the fix is timing: loan terms, a draw schedule, financing equipment over its life. If it can't, the problem is bigger than timing.

Venture-backed: Usually a large one-off outflow, such as equipment or a deposit. Put it in the forecast on the date it actually clears, then recheck runway and whether the current cash still funds the milestone.

Operations don't cover themselves · Bank balance holding

Funded burn

Owner-run: A loan, a credit line or your own money is covering the gap. Unless it's a short, known dip, such as a seasonal month or one large late payment, it's a business-model problem the borrowing is hiding. Too often, the first sign is a full credit line.

Venture-backed: This is the plan by design. The question is whether each dollar of burn is buying progress toward the milestone. That's the burn multiple, below.

Operations don't cover themselves · Bank balance falling

Model problem, with a clock

Owner-run: Unless it's a known timing dip, price, mix or cost structure has to change. Fixing payment timing alone only moves the date.

Venture-backed: Runway is the clock. Plan the raise and a fallback early enough that the raise can finish before cash gets tight.

Two rules that hold in either version

**1. Financing pays for burn. It never reduces it.** A loan draw, an owner contribution or an investor's wire adds to the bank balance, but it isn't a customer collection. Leave it out of cash in when you calculate either version.

**2. Read the trend across several months.** One balloon payment, quarterly tax payment or large late collection can make an ordinary month look like a crisis, or a bad month look fine. Look at the run of months, and note what made any single month unusual.

## The numbers to track

If you run an owner-run business

### Your floor, your committed costs, and how far collections can fall

Your floor and your committed costs give you two quick stress tests. Take the home-services business above, with an illustrative $60,000 in the bank:

- **Before any cuts:** $60,000 ÷ the $26,000 floor ≈ 2.3 months.
- **After cutting everything you can:** $60,000 ÷ $20,000 of committed costs ≈ 3 months.

Treat both as a simplified stress scenario, not a survival forecast. They assume collections stop completely, variable costs stop with them, and nothing else changes. In practice, cuts take weeks to land (notice periods, a final payroll, contract terms), customers still pay for work you've already done, and some bills come due at awkward times. The useful output is the order of magnitude, and which costs you'd cut first. That's the number to know before you sign a lease or add a truck loan.

The second number is your **[margin of safety](https://www.countabl.io/tools/glossary#g-margin-of-safety)**: how far collections can fall before you stop covering your floor. Work out your [break-even revenue](https://www.countabl.io/notes/break-even) on a cash basis. That's your floor divided by the share of each collected dollar left after variable costs. Then compare it with what you collect.

- **Home-services business:** 67 cents of each $1 is left after variable costs. $26,000 ÷ 0.667 ≈ $39,000 break-even against $42,000 collected. A margin of safety of about 7%, or about $3,000 a month.
- **Contractor:** about 32 cents is left. $60,000 ÷ 0.317 ≈ $189,000 break-even against $205,000 collected. About 8%.
- **Agency:** about 64 cents is left. $130,000 ÷ 0.641 ≈ $203,000 break-even against $195,000 collected. It's about $8,000 a month short already.

One caution: this math treats collections as a stand-in for sales. If collections drop because you sold less, variable costs fall too, and the math works as shown. If they drop because a customer pays late, you've already paid for the materials and the labor, so the full amount comes out of cash. In the short run, a slow payer can hurt more than a lost job of the same size.

No tool can split committed from cuttable for you. Whether a supplier contract can be canceled, or whether you'd really cut that salary in a bad quarter, are judgments about your own obligations. They're the part of this exercise worth your time.

If you run a venture-backed startup

### Runway against the milestone, and what each dollar buys

Burn is part of a venture plan. The question is whether it reaches the milestone that earns the next round, or profitability, before the cash runs out. So compare two dates: the month cash would run low on the current plan, and the month you expect to have the evidence plus the time it takes to raise on it. [How to calculate your real runway](https://www.countabl.io/notes/real-runway) walks through why those dates are often months apart.

The efficiency check is [burn multiple](https://www.countabl.io/tools/know-your-numbers#c-23): net burn divided by net new annualized revenue *over the same period*. Monthly figures are noisy, so a quarter is usually a fairer read. For a subscription business, the denominator is net new [ARR](https://www.countabl.io/tools/glossary#g-arr). For a services or usage-based company, use the increase in monthly revenue run-rate, times twelve. Example: burn $240,000 over a quarter while ARR grows from $1.0 million to $1.12 million. That's $120,000 of net new ARR, and a multiple of 2.0x: two dollars burned for every dollar of annual revenue added. Investors read it against your stage, and the benchmark bands are on the burn multiple card.

Committed costs matter here too, as the starting point for a fallback. Paul Graham's [default alive](https://paulgraham.com/aord.html) test asks a plain question: if spending stays where it is and revenue keeps growing at its recent rate, does the company reach profitability before the money runs out? If the answer is no, a Default Alive plan sets out what you would cut, in what order, and whether that gets you to profitability on the cash you have if the next round slips.

When to start? Our usual guide is to start that plan, alongside the raise, once runway falls to roughly nine to six months. Treat that as a starting point, not a rule. Start earlier if your raises have taken longer than six months, if leases or hiring commitments lock in spending, or if revenue is uncertain enough that one lost customer would move runway by months.

## Reading the trend

The level of burn matters less than its direction. Three patterns are worth catching early.

**1. Burn growing faster than revenue.** This is growth that costs more than it brings in. Owner-run: In an owner-run business it's usually accidental, and it shows up in the bank before it shows up in the P&L. Venture-backed: At a startup it can be the plan. The burn multiple tells you whether it's a good plan.

**2. Committed share creeping up.** This is a change in *mix*. Each new salary, lease or annual contract turns a cost you could stop next month into one you're committed to for a year. Total spending can stay flat while it happens. Replace $30,000 a month of freelancers with $30,000 a month of salaried staff and spending hasn't moved, but your committed costs just rose by $30,000. It happens one reasonable decision at a time, and it's one reason [your P&L is not your business](https://www.countabl.io/notes/your-pnl-is-not-your-business).

**3. Net burn steady, gross burn rising.** This is a change in *size*. You're getting bigger without getting safer. Go from $200,000 out and $180,000 in to $400,000 out and $380,000 in, and net burn is $20,000 both times. But if the mix of fixed and variable costs hasn't changed, your floor has doubled too.

Mix · illustrative

Same spending, more of it committed

Before · $150K out, 60% committed

$90K

$60K

After · $150K out, 80% committed

$120K

$30K

$30K of freelancers became salaried staff. Total spending is unchanged. Committed costs rose by $30K.

Size · illustrative

Same net burn, double the exposure

Before · out $200K, in $180K

Out $200K

In $180K

After · out $400K, in $380K

Out $400K

In $380K

Net burn is $20K both times. With the same cost mix, the floor doubles.

Mix and size are different problems, and they often arrive together: growth adds people, and people are committed cost.

## When expansion gets ahead of cash

One company came to Countabl while expanding into physical locations. With no forecast connecting hiring, construction, equipment and uncertain revenue growth, leadership was weighing each commitment separately. Monthly net burn had climbed above $300,000.

Countabl built a cash forecast and recommended four changes, which the company put into action:

- Pause construction on a new facility that was still months from completion and would need more equipment and staff.
- Reduce management headcount hired ahead of the company's needs.
- Focus marketing and sales on bringing customers into the existing facility.
- Require a second approver for payments above an agreed amount.

Work began in July, and the changes were in place by September. Net burn fell each month through October, November and December, to about $100,000 a month. At the time of the revised forecast, the changes were projected to add roughly three months of runway.

The cost of expansion isn't just construction. It's the equipment, people and other commitments that follow, often before the revenue arrives. Seeing those costs together let leadership put cash back into growing the business it already had.

## Run your numbers

If you run an owner-run business

**Start with the free calculator.** The [burn rate calculator](https://www.countabl.io/tools?t=burn) gives you gross burn, net burn and runway. Tell it how much of your spending is variable and it adds your floor and margin of safety. For total cash out, enter everything that left the bank, including debt payments, tax, equipment and draws. For cash in, enter only what customers paid you.

**Then lay it out week by week.** The calculator works from a monthly average, and the average is what hides your worst week. The [13-week cash flow model](https://www.countabl.io/hubfs/countabl-13-week-cash-flow.xlsx) is a free Excel download with no email required. It shows the week payroll, rent and a tax payment all land, before that week arrives.

Related reading: [break-even](https://www.countabl.io/notes/break-even), [reading a cash flow statement](https://www.countabl.io/notes/how-to-read-a-cash-flow-statement), and [why AR isn't revenue](https://www.countabl.io/notes/ar-is-not-revenue).

**If you'd rather have it built on your own books,** the [small business Cash Clarity Sprint](https://www.countabl.io/services) builds a 13-week cash flow forecast and a Long-Range Forecast from your actual numbers, and ends with a CFO memo on what to do next. It starts at $3,000 and three weeks, and takes longer for a more complex business. It begins with a 30-minute call: [we scope the work, agree on timing and, if there's a fit, send a proposal the same day](https://www.countabl.io/how-it-works). No prep is needed. If your books are behind, say so on the call: catching them up or cleaning them up can change the price and timing, and the proposal accounts for it. Bringing old books current is also available on its own as a [Historical Cleanup](https://www.countabl.io/services#scoped-projects).

If you run a venture-backed startup

**Start with the free calculators.** The [runway calculator](https://www.countabl.io/tools?t=runway&for=startup) takes your cash, burn, revenue growth and planned hires and shows when the money runs out on today's plan. Compare that date with the milestone plus the time to raise. The [burn rate calculator](https://www.countabl.io/tools?t=burn&for=startup) adds your burn multiple once you enter net new annualized revenue for the same month.

**Then model the path to the milestone.** The [Startup Long-Range Forecast](https://www.countabl.io/hubfs/countabl-startup-long-range-forecast.xlsx) is a free Excel model with hiring, collections, and base, downside and reduced-spend cases. No email required. [How to calculate your real runway](https://www.countabl.io/notes/real-runway) walks through it.

Related reading: [can you afford this hire](https://www.countabl.io/notes/can-you-afford-this-hire) and [raise and dilution](https://www.countabl.io/notes/raise-and-dilution).

**If you want it built on your numbers,** the [startup Cash Clarity Sprint](https://www.countabl.io/services) builds a Long-Range Forecast tied to what the raise has to achieve, and a CFO memo on what to change. It starts at $3,000 and three weeks, and takes longer for a more complex business. It begins with a 30-minute call: [we scope the work, agree on timing and, if there's a fit, send a proposal the same day](https://www.countabl.io/how-it-works). No prep is needed. If the books are behind, catching them up can change the price and timing, and the proposal accounts for it. If a burn rate is unsustainable, we say so.

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Taylor White

Cofounder and CEO of Countabl. In the industry since 2010, working across accounting, finance and advisory, with depth in financial operations, forecasting, cash management and capital strategy. A Marine veteran, he takes an operator-first approach: clean up the numbers, then connect them to the decisions that actually matter.

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